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In all competitions for Chelsea U19s, 21s and 23 he's scored six goals. He's still not a regular in what is a very strong development team at Stamford Bridge.

On Sunday, he added to his goal tally with the only goal of the game in a 1-0 win over London rivals West Ham.

How has he got on at Chelsea?

He made his U18 debut while he was still available for the U15 team in 2013/14 but he missed the entire season the following year after a number of injuries.

Since returning to fitness he has kicked on and was a vital player for the U18 side before stepping up the U23 team where he is fighting to make himself a regular.

St Clair skips past Felix Beijmo of Sweden (Image: SNS)

He was part of the Chelsea U18 team that won the treble in the 2016/17 season.

The side won the League, the League Cup and the FA Youth Cup. As part of Jody Morris' side, he scored one of three goals for the U18s against Reading to seal the championship, just days after they leapfrogged Arsenal and on the same day Chelsea won the Premier League.

What does the future hold?

St Clair signed a two-year professional deal with the club in 2016 which runs out this summer.

So far, he hasn't agreed a new contract but he is expected to sign a new deal that will keep him at the club.

He's a current team mate of former Rangers midfielder Billy Gilmour , while ex-Celtic prospect Islam Feruz is still on the books at Chelsea despite years of being sent out on loan and failing to impress.

Chelsea is a hard place for a youth player to break into the first team but St Clair is one who is highly-rated within the club.